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Note 6 - Loans and Allowance for Loan Losses - Changes in Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Commercial Portfolio Segment [Member] | FUSB [Member]          
Beginning balance     $ 133 $ 141 $ 141
Charge-offs     (1)  
Recoveries     28   61
Provision (reduction in reserve) for loan losses     (31)   (69)
Ending balance $ 129   129   133
Ending balance, individually evaluated for impairment     80
Ending balance, collectively evaluated for impairment 129   129   53
Total loans 54,459   54,459   29,377
Ending balance, individually evaluated for impairment     444
Ending balance, collectively evaluated for impairment 54,459   54,459   28,933
Commercial Portfolio Segment [Member] | ALC [Member]          
Beginning balance    
Charge-offs      
Recoveries      
Provision (reduction in reserve) for loan losses      
Ending balance    
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment    
Total loans    
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment    
Commercial Portfolio Segment [Member] | FUSB and ALC [Member]          
Beginning balance     133 141 141
Charge-offs     (1)  
Recoveries     28   61
Provision (reduction in reserve) for loan losses     (31)   (69)
Ending balance 129   129   133
Ending balance, individually evaluated for impairment     80
Ending balance, collectively evaluated for impairment 129   129   53
Total loans 54,459   54,459   29,377
Ending balance, individually evaluated for impairment     444
Ending balance, collectively evaluated for impairment 54,459   54,459   28,933
Commercial Real Estate Portfolio Segment [Member] | FUSB [Member]          
Beginning balance     1,118 2,810 2,810
Charge-offs     (40)   (767)
Recoveries     234   12
Provision (reduction in reserve) for loan losses     (378)   (937)
Ending balance 934   934   1,118
Ending balance, individually evaluated for impairment 413   413   230
Ending balance, collectively evaluated for impairment 521   521   888
Total loans 139,455   139,455   107,670
Ending balance, individually evaluated for impairment 2,107   2,107   2,018
Ending balance, collectively evaluated for impairment 137,348   137,348   105,652
Commercial Real Estate Portfolio Segment [Member] | ALC [Member]          
Beginning balance    
Charge-offs      
Recoveries      
Provision (reduction in reserve) for loan losses      
Ending balance    
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment    
Total loans    
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment    
Commercial Real Estate Portfolio Segment [Member] | FUSB and ALC [Member]          
Beginning balance     1,118 2,810 2,810
Charge-offs     (40)   (767)
Recoveries     234   12
Provision (reduction in reserve) for loan losses     (378)   (937)
Ending balance 934   934   1,118
Ending balance, individually evaluated for impairment 413   413   230
Ending balance, collectively evaluated for impairment 521   521   888
Total loans 139,455   139,455   107,670
Ending balance, individually evaluated for impairment 2,107   2,107   2,018
Ending balance, collectively evaluated for impairment 137,348   137,348   105,652
Consumer Portfolio Segment [Member] | FUSB [Member]          
Beginning balance     27 114 114
Charge-offs     (30)   (17)
Recoveries     40   70
Provision (reduction in reserve) for loan losses     (26)   (139)
Ending balance 11   11   27
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 11   11   28
Total loans 6,289   6,289   7,057
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 6,289   6,289   7,057
Consumer Portfolio Segment [Member] | ALC [Member]          
Beginning balance     2,201 2,336 2,336
Charge-offs     (2,218)   (2,552)
Recoveries     500   712
Provision (reduction in reserve) for loan losses     1,808   1,706
Ending balance 2,291   2,291   2,201
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 2,291   2,291   2,202
Total loans 80,915   80,915   76,131
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 80,915   80,915   76,131
Consumer Portfolio Segment [Member] | FUSB and ALC [Member]          
Beginning balance     2,228 2,450 2,450
Charge-offs     (2,248)   (2,569)
Recoveries     540   782
Provision (reduction in reserve) for loan losses     1,782   1,567
Ending balance 2,302   2,302   2,228
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 2,302   2,302   2,230
Total loans 87,204   87,204   83,188
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 87,204   87,204   83,188
Consumer Portfolio Segment [Member]          
Total loans 87,204   87,204   83,188
Residential Real Estate [Member | FUSB [Member]          
Beginning balance     37 421 421
Charge-offs     (10)   (68)
Recoveries     16   111
Provision (reduction in reserve) for loan losses     64   (428)
Ending balance 107   107   37
Ending balance, individually evaluated for impairment 5   5  
Ending balance, collectively evaluated for impairment 102   102   36
Total loans 32,559   32,559   30,730
Ending balance, individually evaluated for impairment     252
Ending balance, collectively evaluated for impairment 32,559   32,559   30,478
Residential Real Estate [Member | ALC [Member]          
Beginning balance     251 346 346
Charge-offs     (49)   (187)
Recoveries     34   22
Provision (reduction in reserve) for loan losses     (75)   69
Ending balance 161   161   251
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 161   161   250
Total loans 14,462   14,462   17,233
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 14,462   14,462   17,233
Residential Real Estate [Member | FUSB and ALC [Member]          
Beginning balance     288 767 767
Charge-offs     (59)   (255)
Recoveries     50   133
Provision (reduction in reserve) for loan losses     (11)   (359)
Ending balance 268   268   288
Ending balance, individually evaluated for impairment 5   5  
Ending balance, collectively evaluated for impairment 263   263   286
Total loans 47,021   47,021   47,963
Ending balance, individually evaluated for impairment     252
Ending balance, collectively evaluated for impairment 47,021   47,021   47,711
Other Loans [Member] | FUSB [Member]          
Beginning balance     14
Charge-offs      
Recoveries      
Provision (reduction in reserve) for loan losses     21   14
Ending balance 35   35   14
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 35   35   14
Total loans 46   46   379
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 46   46   379
Other Loans [Member] | ALC [Member]          
Beginning balance    
Charge-offs      
Recoveries      
Provision (reduction in reserve) for loan losses      
Ending balance    
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment    
Total loans    
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment    
Other Loans [Member] | FUSB and ALC [Member]          
Beginning balance     14
Charge-offs      
Recoveries      
Provision (reduction in reserve) for loan losses     21   14
Ending balance 35   35   14
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 35   35   14
Total loans 46   46   379
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 46   46   379
Other Loans [Member]          
Total loans 46   46   379
FUSB [Member]          
Beginning balance     1,329 3,486 3,486
Charge-offs     (81)   (852)
Recoveries     318   254
Provision (reduction in reserve) for loan losses     (350)   (1,559)
Ending balance 1,216   1,216   1,329
Ending balance, individually evaluated for impairment 418   418   310
Ending balance, collectively evaluated for impairment 798   798   1,019
Total loans 232,808   232,808   175,213
Ending balance, individually evaluated for impairment 2,107   2,107   2,714
Ending balance, collectively evaluated for impairment 230,701   230,701   172,499
ALC [Member]          
Beginning balance     2,452 2,682 2,682
Charge-offs     (2,267)   (2,739)
Recoveries     534   734
Provision (reduction in reserve) for loan losses     1,733   1,775
Ending balance 2,452   2,452   2,452
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 2,452   2,452   2,452
Total loans 95,377   95,377   93,364
Ending balance, individually evaluated for impairment    
Ending balance, collectively evaluated for impairment 95,377   95,377   93,364
FUSB and ALC [Member]          
Beginning balance     3,781 6,168 6,168
Charge-offs     (2,348)   (3,591)
Recoveries     852   988
Provision (reduction in reserve) for loan losses     1,383   216
Ending balance 3,668   3,668   3,781
Ending balance, individually evaluated for impairment 418   418   310
Ending balance, collectively evaluated for impairment 3,250   3,250   3,471
Total loans 328,185   328,185   268,577
Ending balance, individually evaluated for impairment 2,107   2,107   2,714
Ending balance, collectively evaluated for impairment 326,078   326,078   265,863
Beginning balance     3,781    
Provision (reduction in reserve) for loan losses 680 $ (78) 1,383 $ (199)  
Ending balance 3,668   3,668   3,781
Total loans $ 328,185   $ 328,185   $ 268,577